13. In a Millikan's oil drop experiment a drop is observed to fall with a terminal speed 1.4mm/s in the absence of electric field. When a vertical electric field of 4.9x10v/m is applied the droplet is observed to continue to move downward at lower terminal speed 1. 71 mm/s. calculate the charge on the drop (Density of oil = 750kg/m3, viscosity of air=1.81 x 10^-5 kg/ms ,density of air=1.29 kg/m3) ​

Iwould think it is temperature, silica, oxides (gases)

Hi. i believe this is called a scientific  theory.cheers!

Answer;

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

explanation; convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids.convection currents transfer heat from one place to another by mass motion of a fluid. earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.